<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing" href="https://bugs.freedesktop.org/show_bug.cgi?id=91880#c182">Comment # 182</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - Radeonsi on Grenada cards (r9 390) exceptionally unstable and poorly performing" href="https://bugs.freedesktop.org/show_bug.cgi?id=91880">bug 91880</a> from <a class="email" href="mailto:cheald@gmail.com" title="Chris Heald <cheald@gmail.com>"> Chris Heald</a> <pre>Just adding a data point here, I've got an MSI R9 390 running on Ubuntu 18.04 on 4.15.0-10-generic - I haven't had any stability issues, but I have had maddening screen flickering/corruption. I'm running dual 2560x1440 monitors off the card, which forces the memory clock to 1500MHz. However, when the GPU clock is at the 300MHz level, I get horrendous artifacting any time an accelerated portion of the screen is drawn. I can easily reproduce the issue by mousing over certain KDE widgets which are acclerated. Interestingly, running glxgears doesn't cause the issue. * Setting power_dpm_force_performance_level -> high fixes it (but runs the clock up to its max, obviously) * Setting power_dpm_force_performance_level -> manual and then `echo 1234567 > pp_dpm_sclk` fixes it, with the GPU clock fixed to 500MHz. I've been up and down this issue with both radeon and amdgpu drivers; neither seems to make a difference. # lspci -nnk | grep -iA2 vga 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii PRO [Radeon R9 290/390] [1002:67b1] (rev 80) Subsystem: Micro-Star International Co., Ltd. [MSI] Hawaii PRO [Radeon R9 290/390] [1462:2015] Kernel driver in use: amdgpu # cat vbios_version MS-V30823-F6 (Interestingly, this BIOS is newer than anything on techpowerup. I was hoping a BIOS flash would fix it, but I can't find anything newer) I'll attach dmesg and Xorg logs as well. If I can provide extra data points, I'd like to help.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>